By W. Gupton Jr.
This ebook is one in a chain addressing construction platforms design,operation, and upkeep. the cloth awarded during this ebook can be utilized for workplace reference, for formal in-house education courses, and for casual self study.The fabric isn't meant for use in its place for brands’ directions for particular gear. This publication is written to supply an entire and concise referencevolume for folks engaged within the operation and upkeep of computerized keep an eye on platforms serving construction heating, ventilating, and air-con structures, together with refrigerating machines, and interface to construction automation structures (BAS) structures. strength administration and keep watch over procedure (EMCS) are of such various kinds and preparations that it isn't attainable to hide them during this booklet.
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Extra resources for HVAC Controls - Operation & Maintenance
A steam valve, when throttled down to near closed, is subject to seat damage, called wire-drawing. A water coil, when using a modulating 3-way mixing valve, may use a secondary pump in the common line from the coil, as shown in Figure 2-6, to provide a constant water movement through the coil. A variation on this sequence may be used which will employ a dual-input controller with setpoint reset from outside temperature, as shown in Figure 2-7. Face and bypass damper control. Steam preheat coil sections may be provided in an enclosure with a system of internal face and bypass dampers which allows the steam coil to be controlled with a 2-position valve for daily “on-off” control, while the actual temperature control is done by bypassing jets of unheated air between finned tube sections of the steam coil.
Balancing Balancing of terminal units for airflow is done as required by the specific type of terminal device installed. Zoning dampers and multioutlet terminal units are tested by the “sum-of-the-outlets” method, where all the outlets served by a specific terminal device are measured for airflow and proportionally balanced; then the total airflow is balanced by positioning the zone balancing damper or by adjusting the air volume regulator setpoint. Terminal devices serving a single outlet are balanced directly by testing the outlet flow, then positioning the zone balancing damper, or by adjusting the air volume regulator setpoint.
The balancing of outlets should be done by adjusting the branch damper. The damper at the outlet should only be used for changing the air pattern, so that the increased noise generated in increasing the pressure loss for balancing will be attenuated before reaching the conditioned space. Set-Up and Checkout Techniques Set-up of terminal devices requires that all airflow data be obtained from building design drawings to provide a basis for cfm settings on air volume regulators. Some trial-and-error testing may be required in establishing minimum cfm settings for heating, particularly when electric resistance heaters are used.
HVAC Controls - Operation & Maintenance by W. Gupton Jr.